As per crazy4oldcars and Rusty, that's just the way air compressors work. I've never had it cause a problem with tires and I live in humid South Arkansas. As mentioned above, you can get a water-knockout (cyclone) and/or dryer (desiccant). A cyclone works better with high flow (air tools, paint sprayers, etc) and probably wouldn't work well in your application.
If it bothers you that there is some water in your tires, switch to Nitrogen. Expensive but dry as can be (will even absorb moisture already present in the tire).
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